This guide sets out the law governing where a civil case may be filed, kept, and moved. Part 1 covers subject matter jurisdiction — federal question, diversity, supplemental, and the class action provisions — with the citizenship rules that decide most disputes. Part 2 covers personal jurisdiction from International Shoe through Mallory, including the federal reach of Rule 4(k) and the treatment of internet contacts. Part 3 covers venue, transfer, and forum non conveniens. Part 4 covers removal and remand in operational detail, including deadlines, unanimity, the forum defendant rule, fraudulent joinder, and fee awards. Part 5 covers forum selection clauses and arbitration. Later parts address sovereign defendants, jurisdictional discovery, burdens of proof, waiver, and the appellate posture of each ruling.